Dyar'S Rule as Related to the Number of Instars of the Corn Ear Worm, Heliothis Obsoleta (Fab.), Collected in the Field

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Abstract
The original purpose of the investigation described in this paper was to find out whether the number of instars of the corn ear worm varies under field conditions and, if so, to what conditions of food or environment the variation can be attributed. This project was conceived and the work done entirely by the senior author.